Add debugging config for Visual Studio Code

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            /* Source: https://www.vinnie.work/blog/2020-10-22-vscode-c-debug/#debugging-builds-with-containerized-debugger */
+            "name": "Debug FlowEmu in Docker environment",
+            "type": "cppdbg",
+            "preLaunchTask": "run_docker_debug",
+            "request": "launch",
+            "program": "/usr/bin/flowemu",
+            "cwd": ".",
+            "sourceFileMap": { "/flowemu": "${workspaceFolder}" },
+            "pipeTransport": {
+                "pipeProgram": "docker",
+                "pipeArgs": ["exec", "-i", "channel"],
+                "pipeCwd": "${workspaceFolder}",
+                "quoteArgs": false
+            },
+            "MIMode": "gdb",
+            "setupCommands": [
+                {
+                    "description": "Connect to gdbserver",
+                    "text": "target remote 127.0.0.1:1234",
+                    "ignoreFailures": false
+                },
+                /* Source: https://stackoverflow.com/a/59431811 */
+                {
+                    "description": "Load pretty-printer for libstdc++",
+                    "text": "python import sys; sys.path.insert(0, '/usr/share/gcc/python'); from libstdcxx.v6.printers import register_libstdcxx_printers; register_libstdcxx_printers(None)",
+                    "ignoreFailures": false
+                },
+                {
+                    "description": "Enable pretty-printing for gdb",
+                    "text": "-enable-pretty-printing",
+                    "ignoreFailures": false
+                }
+            ]
+        }
+    ]
+}

.vscode/tasks.json

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+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "run_docker",
+            "type": "shell",
+            "command": "./run.py",
+            "args": ["config/environments/docker"]
+        },
+        {
+            "label": "run_docker_debug",
+            "type": "shell",
+            "command": "./run.py",
+            "args": ["config/environments/docker_debug"],
+            "isBackground": true,
+            /* Source: https://stackoverflow.com/questions/44242048/how-to-make-vscode-not-wait-for-finishing-a-prelaunchtask */
+            "problemMatcher": {
+                "owner": "custom",
+                "pattern": {
+                    "regexp": ".",
+                    "file": 1,
+                    "location": 2,
+                    "message": 3
+                },
+                "background": {
+                    "beginsPattern": ".",
+                    "endsPattern": "Listening on port 1234"
+                }
+            }
+        }
+    ]
+}